Add tests for filter groups

[sarahd93]

Checklist:

• Tests
• CHANGELOG Entry

[codecov]

Codecov Report

Merging #1419 into gsa-8.0 will increase coverage by 0.12%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           gsa-8.0   #1419      +/-   ##
==========================================
+ Coverage    36.97%   37.1%   +0.12%     
==========================================
  Files          961     961              
  Lines        21741   21741              
  Branches      6045    6023      -22     
==========================================
+ Hits          8038    8066      +28     
+ Misses       12387   12366      -21     
+ Partials      1316    1309       -7

Impacted Files	Coverage Δ
gsa/src/web/components/powerfilter/autofpgroup.js	100% <0%> (+50%)	⬆️
.../web/components/powerfilter/applyoverridesgroup.js	85.71% <0%> (+57.14%)	⬆️
gsa/src/web/components/powerfilter/minqodgroup.js	100% <0%> (+60%)	⬆️
...src/web/components/powerfilter/firstresultgroup.js	100% <0%> (+60%)	⬆️
.../web/components/powerfilter/resultsperpagegroup.js	100% <0%> (+60%)	⬆️
...rc/web/components/powerfilter/filterstringgroup.js	100% <0%> (+66.66%)	⬆️
gsa/src/web/components/powerfilter/sortbygroup.js	100% <0%> (+90%)	⬆️

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